NFPA 1932 Standard on Use, Maintenance, and Service Testing of In-Service Fire Department Ground Ladders, 2004 ed. http://www.nfpa.org/assets/files/AboutTheCodes/193 1/1931-A2004-ROP.pdf, (Std: Use, Maint and Srvc Tst of In-Srvc Fr Dept Gr Ladr - Amer) {420 NFC}